EP0507981A1 - Verfahren zur Behandlung von giftigen und schädlichen Metallverarbeitungsschlammen um Metalle und ihre Legierungen zu entfernen - Google Patents

Verfahren zur Behandlung von giftigen und schädlichen Metallverarbeitungsschlammen um Metalle und ihre Legierungen zu entfernen Download PDF

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Publication number
EP0507981A1
EP0507981A1 EP91107101A EP91107101A EP0507981A1 EP 0507981 A1 EP0507981 A1 EP 0507981A1 EP 91107101 A EP91107101 A EP 91107101A EP 91107101 A EP91107101 A EP 91107101A EP 0507981 A1 EP0507981 A1 EP 0507981A1
Authority
EP
European Patent Office
Prior art keywords
sludges
oily
mixture
alloys
solvent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91107101A
Other languages
English (en)
French (fr)
Other versions
EP0507981B1 (de
Inventor
Mario Cauzzo
Gianpiero Perini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
C.R.R.F. SRL
Original Assignee
Crrf Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Crrf Srl filed Critical Crrf Srl
Publication of EP0507981A1 publication Critical patent/EP0507981A1/de
Application granted granted Critical
Publication of EP0507981B1 publication Critical patent/EP0507981B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/26—Treatment of water, waste water, or sewage by extraction

Definitions

  • This invention concerns a method to treat toxic and harmful sludges coming from metal processings so as to remove metals and their alloys, as set forth in the main claim.
  • the method according to the invention is applied to the field of disposal and reuse, after treatment, of sludges containing metallic residues together with oils and/or lubricating coolants produced by the processing of metals and their alloys with removal of materials.
  • oils and/or lubricating coolants prevent, on the one hand, the recycling of the metallic fines contained in the wastes and, on the other hand, prevent disposal of the wastes in refuse dumps.
  • wastes containing oils are collected and taken to a storage zone in the plant processing the metals and are sent at a later time in appropriate containers to a treatment plant.
  • the process to separate the oil is based essentially on the combined, cooperating action of the decantation and flotation steps.
  • the recovered oils form a good-quality fuel, which can be employed as a fuel in an incineration line.
  • both the oils and metallic fines contained in the residues resulting from the processing of metals and their alloys can be recovered.
  • the recovered oils as in the state of the art, form a good-quality fuel product which can be employed as a fuel in an incineration line or for other purposes.
  • the metallic fines can be separated out and converted into a finished end product suitable for delivery to the customers in question or to a specific user.
  • the processing fines are sorted according to the types of metals or alloys processed and according to the types of process undergone, since the end product obtained by the method according to the invention depends on these factors.
  • the processing fines are decanted into the tanks and thereafter the greater part of the liquids or fluids contained in the tanks is pumped out by suitable pump means.
  • a mixture of solvents is immitted into the mixer-separator and, coming into contact with the processing residues therein, causes a physical separation of the components of the processing residues.
  • This mixture of solvents consists advantageously of the following components in the following percentages by volume: - 1,1,1-TRICHLOROETHANE from 50% to 60% - COAL-TAR NAPHTHA SOLVENT from 10% to 15% - WHITE SPIRIT from 25% to 35% - DIISODECILADIPATE from 2.5% to 5%
  • This mixture of solvents is employed in various proportions according to the material to be treated and the quantity of the solvent mixture used varies substantially between the following limits:
  • petroleum-based and chemical solvents can be used instead of the above mixture.
  • the fluid mixture capable of being pumped is sent to a filtration step.
  • the filtration step can be carried out with filter presses, from which there emerge a solid phase containing the fines separated from the oily mixture and a liquid phase containing a mixture of the mixed solvents and of the oils or other foreign fluids included in the initial product.
  • the liquid phase is sent to a distillation column, whence there emerge, on the one hand, the mixture of solvents and, on the other hand, the impurities consisting of the oils and other foreign fluids.
  • the mixture of solvents is returned to the cycle and delivered into the mixer-separator or into a solvent storage tank, whereas the oils and foreign fluids are stored in appropriate tanks and thereafter treated and disposed of according to the regulations in force.
  • the solid phase from the filtration undergoes a dehumidifying and drying step, which reduces the humidity of the product down to a value between 2% and 0%.
  • vapours resulting from the dehumidifying and drying step are sent to a vapour treatment process to recover the solvent, which can be returned to the cycle in the mixer-separator or in the solvent storage tank.
  • the procesing fines when they have been purified of their oily component and of the foreign fluids contained originally in the fines and have been dried, undergo a disintegration step to obtain material having a granule size required by the clients to whom the finished metal will be sold.
  • the attached flow sheet which is given as a non-restrictive example, shows a block diagram of a possible cycle to convert the oily metallic fines of this invention and makes clear the various steps of the method and the flow of the various materials.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)
EP91107101A 1991-04-10 1991-05-02 Verfahren zur Behandlung von giftigen und schädlichen Metallverarbeitungsschlammen um Metalle und ihre Legierungen zu entfernen Expired - Lifetime EP0507981B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD910057 1991-04-10
ITUD910057A IT1247462B (it) 1991-04-10 1991-04-10 Procedimento di trattamento dei fanghi tossici nocivi derivanti dalla lavorazione per asportazione dei metalli e loro leghe

Publications (2)

Publication Number Publication Date
EP0507981A1 true EP0507981A1 (de) 1992-10-14
EP0507981B1 EP0507981B1 (de) 1995-11-15

Family

ID=11420825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107101A Expired - Lifetime EP0507981B1 (de) 1991-04-10 1991-05-02 Verfahren zur Behandlung von giftigen und schädlichen Metallverarbeitungsschlammen um Metalle und ihre Legierungen zu entfernen

Country Status (7)

Country Link
EP (1) EP0507981B1 (de)
AT (1) ATE130202T1 (de)
DE (1) DE69114693T2 (de)
DK (1) DK0507981T3 (de)
ES (1) ES2081386T3 (de)
GR (1) GR3018397T3 (de)
IT (1) IT1247462B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101830612A (zh) * 2010-06-08 2010-09-15 盛敏 一种含油污泥资源化处理工艺及装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072708A (en) * 1980-03-27 1981-10-07 Romet Stahl & Rueckstoff Gmbh A process and an apparatus for treating oil-containing metallic sludges and solids
US4409020A (en) * 1983-01-24 1983-10-11 The United States Of America As Represented By The Secretary Of The Interior Recovery of metals from grinding sludges
EP0241668A1 (de) * 1986-03-19 1987-10-21 ALUMINIA S.p.A. Verfahren zur Rückgewinnung von Abfällen aus der Verarbeitung von Aluminium oder Aluminiumlegierungen und Herstellung von gepresstem Halbzeug

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072708A (en) * 1980-03-27 1981-10-07 Romet Stahl & Rueckstoff Gmbh A process and an apparatus for treating oil-containing metallic sludges and solids
US4409020A (en) * 1983-01-24 1983-10-11 The United States Of America As Represented By The Secretary Of The Interior Recovery of metals from grinding sludges
EP0241668A1 (de) * 1986-03-19 1987-10-21 ALUMINIA S.p.A. Verfahren zur Rückgewinnung von Abfällen aus der Verarbeitung von Aluminium oder Aluminiumlegierungen und Herstellung von gepresstem Halbzeug

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JAPANESE PATENTS GAZETTE Section Ch, Week C42, 26 November 1980 Derwent Publications Ltd., London, GB; Class D, Page 9, AN 74365 C/42 & JP-A-55 115 494 (KOYAMA YUSHI KOGYO) 5 September 1980 *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 90 (C-104)(968) 27 May 1982 & JP-A-57 019 356 ( NIPPON STAINLESS K.K. ) 1 February 1982 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101830612A (zh) * 2010-06-08 2010-09-15 盛敏 一种含油污泥资源化处理工艺及装置

Also Published As

Publication number Publication date
EP0507981B1 (de) 1995-11-15
ES2081386T3 (es) 1996-03-01
DK0507981T3 (da) 1995-12-18
ITUD910057A0 (it) 1991-04-10
GR3018397T3 (en) 1996-03-31
ITUD910057A1 (it) 1992-10-10
ATE130202T1 (de) 1995-12-15
DE69114693D1 (de) 1995-12-21
IT1247462B (it) 1994-12-17
DE69114693T2 (de) 1996-04-18

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